Malicious PDF — malware analysis report

Static analysis result for SHA-256 788c79069e8c9c60…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 11:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ec16f9779cdd2190b368d00708ac1b2 SHA-1: dc5b7faa50f2d49fa7e913458dcd0b680307a326 SHA-256: 788c79069e8c9c601f2e5040111be851bf2f992c18d14a825fec8fd6d4b273a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=mutants+and+masterminds+2nd+edition+pdf PDF link annotation
    • http://jamesandsons.ca/userfiles/file/70680567771.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/90203011021.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/53312285c083a2ed3aeb643901b5507d/88789799153.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/54585030338.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/jijojoto.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a042bc019f2b0f0ba8e1d34692f30423/kuromudexanewesi.pdfIn PDF document text
    • https://unitjaya.com/contents/files/jutikolujudurija.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614156254d4e6---63754373874.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/12257224267.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/57155638099.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/sebonu.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/gejodegiga.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/26752013716.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/72994088931.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b743f5bd---87089185184.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/jewaxuwal.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/31301845455.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/36789002121.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0343b9a3ac672529c5e3a36e417e4202/togifiwonolu.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/gogikoramopinulugofogexus.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/sotekagagifevosolutudoj.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908202647_wnhyli.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/5358869459.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD30 10824 bytes
SHA-256: 1f57a3fc79a0f2784bf8af95fb0baa574cebd69ac7ff912bb54917f6ab290b60
font_01_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 18012 bytes
SHA-256: ce3aa0a1dc694bb543e0f0fe0c9c71b58b3040388aaaa983bcc46a96ec3145ae
font_02_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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